Taking care of pests

[saeedh]

Hi, did a search on the mods available as well as threads but the search didn't come up with any good results, so hopefully this isn't a repeat and if it is, a nudge in the right direction will help.

The question is pretty simple and pertains to a problem some may have experienced. There's a user that is of concern and banning has resulted in 10 different accounts spawned over time by the individual as he has a dynamic ip address and manages to root his way back.

So I was wondering if there'd be a way of banning by a wildcard hostname filter, or if that would be too server intensive, then the more preferable solution of just having a requirement for manual validation by administration of users that would be listed belonging to some hostname range for example.

Any other ideas are welcome too.